The whistle didn’t belong in the alleyway.
It cut through the freezing mountain drizzle with the clean, clockwork pitch of hardened brass. It dropped through three sharp, dropping intervals before snapping upward into an abrupt, bird-like trill. For three years on the northern run between Tern Station and the high timber bridges of Cross-Hollow, Len Vey had blown that exact rhythm through his copper pocket tube whenever a priority packet crossed the station outer edge after second bell. It was the signal that told the stable hands to unlimber a fresh mount, clear the gravel apron, and leave the lantern hanging from the center peg.
Len froze on the wet limestone stone floor, his boots locking against the uneven flags. His sound right hand closed around the curved ash shaft of his sounding pole, the brass collar biting into his palm through the wet wool of his mitten.
Beside him, Bram Ash stopped so suddenly that the iron plates of his town breastplate clinked beneath his heavy oilskin coat. The court guard didn’t ask what the sound was. He was an officer of the Gate precinct. He knew the sound signed name of every whistle, rattle, and warning iron authorized along the customs line. His thick right hand moved inside his coat, easing his ribbed hardwood truncheon from its leather frog with the practiced silence of a man who had worked dark alleys for twenty years.
